Photographic-printing apparatus.



Patented Oct. 12, 1915.

aSTATES PATENT oFFIoE. f

A THEODOR HARBERS, OF LEIPZIG, AGERJYIANY.

i PHOTOGRAPHIC-PRINTING- APPARATUS.

u specification of Letters Patent. l l' Patented ct; 12,. 1915,

Application filled. June 26, 1913, Serial No. 775,922. Renewed Ju1y-22,1915. Serial No. 41,396.

To all whom t may concern Be it known that I, THEODOR HAnnERs, a subjectof the King of Saxony, reslding at i Machern 811", Bezirk Leipzig,Germany,

merchant, (whose post-office address is Machern 811",I Bezirk Leipzig,Germany,)

have invented certain new and useful Improvements inPhotographic-Printing Apparatus, of which the following is aspeciiication.

The'present invention has for its object an apparatus for copyingphotographic negatives.

Although the invention will greatly appeal to amateur photographers, itwill also be -found useful by professionalphotographers, because owingto the small size and the simplicity of the appartus can readily becarried about. u

The invention is -applicable to quick copying papers, silver bromid, andgas-light papers, which permit of making the prints by artificial light.

The apparatus is illustrated in the accompanying drawing, iii which:Figure l is a perspective top view, Fig. 2 is a longitudinal section,and Fig. `,13 shows the lamp to a larger scale.

The apparatus consists of a box a containing a compartment?) in which anelectric battery c is arranged.- Upon the bottom -of the maincompartment of the box a an electric incandescent lamp al` is arranged;

-this lamp is electrically connected with the battery c, the connectionbeing interrupted owing to the fact that one of the poles terminates ina metal plate e fixed to the edge ofthe box while the other terminal isformed by the spring pole piecef of the battery. When the two poles eand f are connected the circuit is closed and the lamp d lighted. Thisbridging of the poles e and fis effected by a metallic spring g securedtothe lid of the box a. The lid,which is hinged to one side v of thebox@,consists of two parts z. and z' whichare hinged together. In the box dA light-reflecting walls 7c are provided Which liso ' reception o mayconsist lof white' cardboard or the Vlike and may be composed ofinclined ory curved surfaces. Upongthe upper edge of the box a a groundglass plate 'm is provided for the ground the negative Z.'When the lidtis entirely.- removed the sensitized paper is placed uponthe'negativeand first of all retained by means of the rear portion I1.vof {theshid in such a manner' that it can be adjusted. The other part iof t e lid is thenv this opening it can be seen Whether the lamp d isalight.

In order to permit of closing the box without at the same time closingthe electric circuit, the bridging or connecting spring g can beturnedaside as indicated in broken lines` in Fig. l.

Notwithstanding the employment ofl a glass lamp bulb and the dispersionof the light by the reflecting walls, and also the ground glass plate,the'illumination of the negative and of the sensitized paper is l notperfectly uniform, as the middle portion receivesdirectl light, so thatover-exposure might leasily occur there. Accordlngly provision is madethat only -indirect light can fall upon the surface tofbe illuminated,that is to say of the lamp bulb d is. rovided with a screen orcovering awhich revents direct radiation in the upward direction. Consequently therays of lightlcan only reach the reflecting walls c which throw them onto the plate, whereby a perfectly uniform illumination of the negativeis obtained. The top of the incandescent bulb may be covered with a coatofblack'paint or the like 6r byfan appropriately shaped piece of paperor metal. I f desired the screen or coat may present reiiectingproperties on its. side directed toward lthe lamp. I i C The 'apparatusthat has been described is characterized by its simplicity, cheapnessreected light. The top' an electric battery secured in saidbox', acircuit, a lamp. secured'to said box in` said circuit, a plvotedcontact' bridge device are ran'gedin-said lid adapted to close -saidcirlcuit when the lid lis fastened to place, reflecting platesarranged.in the box to reflect the rays onto, the negative, and a. screen o rcover on'the top ofthe lamp bulb to pre- .vent directrays from reachingthe negative,

substantially as described.

5 cirouit,;a negative, a support therefor admy hand inpresence'of twosubscribing witn 2. 'A photographic printing apparatus an opaque coverprovided for said lamp comprising a box, a lid therefor, an electricserving to prevent direct rays from reachbattery contained in said box,a circuit, a ing the negative. l lamp secured in said box connected inSaid In testimony whereof I have hereunto set jacent the lidof said box,a pivoted Contact nesses this 13th day of June 1913.

bridge device arranged upon the lid of the a THEODOR HARBERS. box, forcompleting the circuit When the lid Vitnesses: A, is closed, reeetingplates arranged in the RUDOLPH FRICKE,

v10 box to reflect the rays on the negative, and DAVIS KRAHL.

